Heterostructured ZnFe2O4@Ni3S2 nanosheet arrays on Ni foam as an efficient oxygen evolution catalyst

Abstract

Honeycomb-like ZnFe₂O₄@Ni₃S₂ hierarchical nanosheet arrays on Ni foam (NF) were fabricated via a combined hydrothermal and electrodeposition method. The electrode exhibits high oxygen evolution reaction (OER) activity with low overpotentials of 254 mV at 10 mA cm⁻² and 290 mV at 50 mA cm⁻², a small Tafel slope of 39.29 mV dec⁻¹ and excellent durability in an alkaline electrolyte.